Regulation of root nodule formation by control of light quality and its application for legume production

光对豆科植物和根瘤菌之间能量昂贵的固氮共生提供碳至关重要。我已经证明，根瘤的形成是通过JA信号感应红/远红（R/FR）比来进行光形态遗传学控制的。在本研究中，我发现光处理条件对大豆根瘤数量的增加有促进作用。不出所料，3日龄大豆植株经FR处理3周后，根瘤数较未处理对照显著减少。但与未处理大豆相比，3周FR + 4周自然光照处理显著增加根瘤数。如果将该光处理应用于大豆生产，则有可能通过与日本慢生根瘤菌的共生增强根瘤固氮而提高大豆产量。

Light is critical for supplying carbon to the energetically expensive, nitrogen-fixing symbiosis between legumes and rhizobia. I have already showed that root nodule formation is photomorphogenetically controlled by sensing the red/far red (R/FR) ratio through JA signaling. In this study, I found that condition of light treatment for increase of the number of root nodule of soybean. As expected, when three day-old soybean plants were treated by FR for 3 weeks, root nodule number was significantly decreased compared with non-treated control plants. However, root nodule number was significantly increased by 3 weeks FR treatment plus 4 weeks natural sunlight treatment compared with non-treated soybean. If this light treatment is applied for soybean production, there is a possibility that soybean yield increase due to the enhancement of root nodule nitrogen fixation by the symbiosis with Bradyrhizobium japonicum.